Device and Method for Driving Display

1. A display driving device comprising: an overdriving controller configured to generate overdriving pixel data for a current sub-pixel based on a result of comparison between first pixel data for a previous sub-pixel and second pixel data for the current sub-pixel and a color arrangement pattern of the previous sub-pixel and the current sub-pixel in units of horizontal lines of image data; and a data driver configured to generate a source signal for the current sub-pixel based on one of the second pixel data and the overdriving pixel data to supply the source signal to the current sub-pixel, wherein the current sub-pixel is a sub-pixel included in a first horizontal line which is a current horizontal line, the previous sub-pixel is a sub-pixel included in a second horizontal line immediately before the current horizontal line, and the previous sub-pixel and the current sub-pixel are connected to the same data line.

2. The display driving device of claim 1 , wherein the overdriving controller comprises: a compensation value calculation unit configured to calculate a difference value between the first pixel data and the second pixel data, and determine a compensation value using a value mapped to the first pixel data and the second pixel data on a lookup table when the difference value is greater than a threshold value; a correction determination unit configured to detect the color arrangement pattern based on a color of the previous sub-pixel and a color of the current sub-pixel, and determine whether to correct the compensation value based on a result of comparison between the detected color arrangement pattern and a reference color arrangement pattern; and an overdriving pixel data generator configured to reflect a predetermined weight in the compensation value to generate the overdriving pixel data when it is determined to correct the compensation value.

3. The display driving device of claim 2 , wherein the compensation value calculation unit outputs the second pixel data as the overdriving pixel data when the difference value is smaller than or equal to the threshold value, and wherein the overdrive pixel data generator outputs the compensation value determined by the compensation value calculation unit as the overdriving pixel data when it is determined not to correct the compensation value by the correction determination unit.

4. The display driving device of claim 2 , wherein the overdriving pixel data generator varies the weight according to the difference value.

5. The display driving device of claim 2 , further comprising a reference color arrangement pattern determination unit configured to determine the reference color arrangement pattern based on a color arrangement corresponding to a region where measured values spaced apart from reference values are located on color coordinates when there are the measured values spaced apart from the reference values on the color coordinates among values measured when a test image is input to a display panel including the previous sub-pixel and the current sub-pixel.

6. The display driving device of claim 5 , wherein the reference color arrangement pattern determination unit determines a color arrangement in which a first color is changed to a second color as the reference color arrangement pattern when the reference values are located in a region between first coordinate values for the first color and second coordinate values for the second color on the color coordinates, and the measured values spaced apart from the reference values are located in a region between the reference values and the second coordinate values.

7. The display driving device of claim 6 , wherein the correction determination unit determines that the color arrangement pattern corresponds to the reference color arrangement pattern when a color of the previous sub-pixel is the first color and a color of the current sub-pixel is the second color, and wherein the overdriving pixel data generator determines the weight so that the overdriving pixel data becomes smaller than the second pixel data.

8. The display driving device of claim 2 , wherein, when the first pixel data and the second pixel data are not present on the lookup table, the compensation value calculation unit calculates the compensation value for overdriving the current sub-pixel using four values respectively mapped to third pixel data and fourth pixel data adjacent to the first pixel data and fifth pixel data and sixth pixel data adjacent to the second pixel data on the lookup table.

9. The display driving device of claim 2 , wherein the overdriving controller further includes a line memory in which the image data is stored in units of the horizontal lines.

10. The display driving device of claim 9 , wherein the line memory outputs the previously stored horizontal line data for the horizontal lines including previous sub-pixels to the compensation value calculation unit and the correction determination unit when the horizontal line data for current horizontal lines including the current sub-pixel are input from the outside and output to the compensation value calculation unit and the correction determination unit.

11. A method of driving a display, comprising: comparing first pixel data for a previous sub-pixel and second pixel data for a current sub-pixel in units of horizontal lines of image data to determine whether to overdrive the current sub-pixel; generating overdriving pixel data for the current sub-pixel based on a compensation value and a color arrangement pattern of the previous sub-pixel and the current sub-pixel when it is determined to overdrive the current sub-pixel, the compensation value being determined by using a value mapped to the first pixel data and the second pixel data on a lookup table; and converting one of the second pixel data and the overdriving pixel data to a source signal and outputting the source signal to the current sub-pixel, wherein the current sub-pixel is a sub-pixel included in a first horizontal line which is a current horizontal line, the previous sub-pixel is a sub-pixel included in a second horizontal line immediately before the current horizontal line, and the previous sub-pixel and the current sub-pixel are connected to the same data line.

12. The method of claim 11 , further comprising comparing the color arrangement pattern and a reference color arrangement pattern to determine whether to correct the compensation value, wherein, when it is determined to correct the compensation value, the overdriving pixel data is generated by reflecting a predetermined weight in the compensation value, and wherein, when it is determined not to correct the compensation value, the compensation value is determined as the overdriving pixel data.

13. The method of claim 12 , wherein the weight is varied according to a difference value between the first pixel data and the second pixel data.

14. The method of claim 12 , further comprising determining the reference color arrangement pattern based on values measured when a test image is input to a display panel including the previous sub-pixel and the current sub-pixel, and wherein the reference color arrangement pattern is determined based on a color arrangement corresponding to a region where measured values spaced apart from reference values are located on color coordinates when there are the measured values spaced apart from the reference values on the color coordinates among the measured values.

15. The method of claim 14 , wherein, when the reference values are located in a region between first coordinate values for a first color and second coordinate values for a second color on the color coordinates, and the measured values spaced apart from the reference values are located in a region between the reference values and the second coordinate values, a color arrangement in which the first color is changed to the second color is determined as the reference color arrangement pattern.

16. The method of claim 15 , wherein it is determined that the color arrangement pattern corresponds to the reference color arrangement pattern if a color of the previous sub-pixel is the first color and a color of the current sub-pixel is the second color so that it is determined that the compensation value is to be corrected, and wherein the overdriving pixel data is generated to become smaller than the second pixel data.

17. The method of claim 11 , wherein, when the first pixel data and the second pixel data are not present on the lookup table, the compensation value for overdriving the current sub-pixel is calculated by using four values respectively mapped to third pixel data and fourth pixel data adjacent to the first pixel data and fifth pixel data and sixth pixel data adjacent to the second pixel data on the lookup table.